1. Elements, Compounds, and Mixtures

2. 1. Which of the bottles pictured above contain matter?
All the bottles contain matter.

3. 2. Which of the bottles contain a single pure substance?
Bottles (a) and (b).

4. 3. Explain your answer to question #2.
Pure substances include elements and compounds.

5. 4. How many elements are present in each molecule of water?
Two.

6. 5. What is the ratio of hydrogen atoms to oxygen atoms in a water molecule?
Two hydrogens for each oxygen.

7. Two hydrogens for each oxygen. 7. Explain your answer to question #6
6. As you know, ice is frozen water. What would you expect the ratio of hydrogen atoms to oxygen atoms to be in a molecule of ice?
Two hydrogens for each oxygen.
7. Explain your answer to question #6
Ice and water are the same substance (H2O)

8. 8. Bottles (c) and (d) both contain mixtures
8. Bottles (c) and (d) both contain mixtures. How are these mixtures similar?
They are both mixtures of hydrogen and oxygen.

9. 9. Bottles (c) and (d) both contain mixtures
9. Bottles (c) and (d) both contain mixtures. How are these mixtures different ?
The amounts of hydrogen and oxygen vary.

10. 10. How can we prove that saltwater is a mixture?
By separating it into salt and water through physical means. Or
By having samples of saltwater that vary in the ratio of salt and water.

11. 11a. Rice Pudding

12. a. Rice Pudding
Heterogeneous mixture

13. b. Copper

14. b. Copper
Element

15. c. Propane

16. c. Propane
C3H8 compound

17. d. Air

18. d. Air
Homogeneous Mixture (Solution)

19. e. Magnesium Chloride

20. e. Magnesium Chloride
MgCl2 compound

21. f. Mercury

22. f. Mercury
Element

23. g. Maple Syrup

24. g. Maple Syrup
Homogeneous Mixture (Solution)

25. h. Baking Soda

26. h. Baking Soda
NaHCO3 compound

27. i. Chex Party Mix

28. i. Chex Party Mix
Heterogeneous mixture

29. j. White Gold

30. j. White Gold
An alloy of gold and a white metal such as nickel or palladium
Homogeneous Mixture (Solution)